14-bolt Full Floater Disc Swap

Howdy y'all,

I have a 1998 Suburban K2500 with the 14-bolt full floater in it and hate the squishy brakes (my wife is scared to drive it). I think that most of the problem is in the GMT400 master but there is no swapping to a GMT800 master with the hydroboost due to the diameter of the hydroboost being different between the generations. While I think I could swap the mounting plate and swap/modify the pedal rods this would still leave me with a disc/disc master on a disc/drum truck.

I've searched and searched and can't really find a well documented swap of a later GMT400 2500/3500 set of discs off of a 14-bolt full floater (I also looked for AAM 10.5 and 11.5). I saw one posted somewhere that seemed to indicate I would need a 60mm spacer behind the backing plate. He also modified the hub off of the later truck but was using parts from a 11.5, is the GMT800 hub needed if it's from a 10.5? Any help would be appreciated.

Thanks

The brakes were fine from factory, no need to re-invent the wheel. New vehicles have better brakes yes, but if yours are working as GM intended, they will be adequate.

Have the rear shoes adjusted up and the system bled properly with a tech 2 scantool, go to the General for this.

If the system has been open, and not bled properly in the past, you may even have corrosion in your ABS module.

I just changed out all the hoses, the front calipers and flushed the system. It's a marked improvement over what it was but still has a lot of initial squish and it doesn't feel like it's even coming close to kicking in the ABS in a panic stop. From what you are saying I should make sure the rear shoes are adjusted and get the system bled with a TECH 2?

Thanks

Yes. The rears have to be adjusted up tight prior to bleeding, and a Tech 2 scan tool is the recommended procedure.

Theres a writeup on here for the newer M/C conversion. I did it on my K2500 with hydroboost. You hog out the front of the hydroboost unit a little, and then bolt the late model M/C on, get an adapter fitting for one of the lines and its the best pedal you will have. I also did the Powerstop Z36 truck and tow kit and my brakes are really good. I was going to convert to disc but didn't like not having a parking brake with most conversions. So I decided to do this first. But, if you have a really spongy pedal you should adjust rear brakes, and have them bled right.

There was a link on GMT400 that took me here.

http://www.fullsizechevy.com/forum/...Brakes-OBS-Hydroboost-with-NBS-Master-project

There is a GMT400 Hydroboost as well.

You can utilize the GMT800 stuff, but you need a spacer, which you need to make, as I can't find anyone who was selling it alone.

Since all my stuff was junk anyway, I threw it all away and used the Lugnut4x4.com kit, which I am very happy with and included everything I needed, for less than I could buy it for.

Yours being a FF, will be even cheaper than mine was.